Vat dye.



.UNITED STATES PATENT o F on 'WILHELM BAUER, OF'VOHWINKEL, AND ALFREDHERBE AND 'BUDOLF MAYER, F ELBERFELD, GERMANY, ASSIGNORS TOFARBENFABBIKEN VORM. IFBIEIDB. BAYER &

00., OF ELBERFELD, GERMANY, A CORPORATION OF GERMANY.-

' VAT DYE.

Ho Drawing, I

Specification of Letters Patent. Patented Oct. 10, 1911. Applicationfiled July 21, 1910. Serial No. 573,048. I I

To-all whom may concern:

Be it .known that we, WILHELM BAUER,

residingat Vohwinkel', and ALFRED HERRE- and RUDoLr MAYER, residing atElberfeld, Germany, citizens of. the German Empire, have invented newand useful Improvements in Vat Dye, of which the following is aspecification.

j zo

Our invention relates to the manufacture and product-ion of new andvaluable vat'dye- They are obtained by condensing beta-naphthisatinderivatives in which the oxygen of the alpha-keto group is replaced byeasily movable or replaceable substituents, e g.'halogen, sulfur, theamino group, the alkoxy group with a para-substituted 1- 'n aphthol,especially"4-ethoxy-l-naphthol, 4-

bronio-l-naphthol, l-chloro-l-naphthol.

The new dyes which probably contain in their molecule the group:

R meaning the naphthalin nucleus of the meta-naphthisatin, R, asubstituting group,

are in a dry state dark crystalline powdersv with ametallic. lusterwhich are soluble in hot nitrobenzene generally with a blue coloration,and which yield with hydrosulfite and caustic soda lyegenerallyyellowvats dyeing'cotton after exposure to air gray to blackshades remarkable for theirfastness to chlorin. r

i In order to illustrate thenew process more fully we can proceed asfollows, the parts being by weight -197 parts of beta-naphthisatin areconverted into the alpharchlorid by heating them with 220 parts of PCl,and

3500 parts of dry chlorobenzene, The mixture thus 'obtained 'is thenaddedto'a solution, whichgis well stirred, of 250partsofl-bromo-l-naphthol in 1500 parts of dry chlorobenzene; stirringis continued for 12' hours. The dyeis filtered ofi' and-washed withbenzene and ether and can be further purified by a recrystallizationfrom nitroenzehe, It is a' dark crystalline powder with a metalliclustervhaving probably the formula dark blue'color, in' hot nitrobenzenewith a greenish-blue color. It forms-a yellow vat with hydrosulfite andcaustic alkali, fromwhich .cotton is dyed after exposure to air in fastgray to black shades. Its formation takes robably place according tothefollowing ormulaez bemna tmsatm-awmorid.

1-antlir'ol "\X U IYW We claim 1., The herein described new dyestuffs Iwhich probably contain in their molecule the group: I l

v I, v V R- meaning the naphthalin nucleus of the beta-naphthisatin, R asubstituting group, which dyestufi's are in a dry state dark crystallinepowders wit-h a metallic luster which are soluble in hot nitrobenzene'generally with a blue coloration, and which yield with hydrosulfite, andcaustic soda lye vats dyeing cotton after exposure to air from gray tocrystalline powder tvith a metallic luster, black shades remarkable fortheir fast-mess soluble in concentrated sulfuric acid with a to chlorin,substantially as described. dark blue color, and which yields with hy-20 2. The herein described new dyestuff havdrosulfite and caustic sodalyea yellow vat. 5 ing probably the formula: from which cotton is dyed agray to black A remarkable for its fastness to chlorin, substantiall'yas described. I I Intesitinioiny whlereof We hay; hereunto 25 s set our12111 S in tie presence 0 two su 10 -oo 9 scribing Witnesses.

\/\ WILHELM BAUER. [as

ALFRED HERRE. [1 s.]

RUDOLF MAYER. he

15 I I W tnesses a v CHAS. J. WRIGHT,

.which dyestufi is in a dry state a dark WALTER VONNEGUT.

Itlis hereby certified that in Letters Patent No. 1,005,140; grantedOctober 10, 1911, upon the application of Wilhelm Bauer, of Vohwi'nkel,and Alfred Herre and Rudolf Mayor, of Elberfeld, Germany, for animprovement in Vat Dyes, an error appears in the printed specificationrequiring correction as follows: Page 1, line 70, beginning with theword Its strike out all matter to and including line 8 6; and that thesaid Letters Patent should be read with this correction therein that thesame may conform to. the record of-the case inthe Patent Oifice.

- Signed and sealed this 30th day of anuary, A. 1)., 1912 g [sEAL] 7 yC. C. BILLINGS,

Acting Oommzlsionr of Patents.

orrectlon in Letters Patent No. 1,005,140.

cotton after exposure to air from gray to crystalline powder tvith ametallic luster, black shades remarkable for their fast-mess soluble inconcentrated sulfuric acid with a to chlorin, substantially asdescribed. dark blue color, and which yields with hy- 20 2. The hereindescribed new dyestuff havdrosulfite and caustic soda lyea yellow vat. 5ing probably the formula: from which cotton is dyed a gray to black Aremarkable for its fastness to chlorin, substantiall'y as described. I IIntesitinioiny whlereof We hay; hereunto 25 s set our 12111 S in tiepresence 0 two su 10 -oo 9 scribing Witnesses.

\/\ WILHELM BAUER. [as

ALFRED HERRE. [1 s.]

RUDOLF MAYER. he

15 I I W tnesses a v CHAS. J. WRIGHT,

.which dyestufi is in a dry state a dark WALTER VONNEGUT.

Itlis hereby certified that in Letters Patent No. 1,005,140; grantedOctober 10, 1911, upon the application of Wilhelm Bauer, of Vohwi'nkel,and Alfred Herre and Rudolf Mayor, of Elberfeld, Germany, for animprovement in Vat Dyes, an error appears in the printed specificationrequiring correction as follows: Page 1, line 70, beginning with theword Its strike out all matter to and including line 8 6; and that thesaid Letters Patent should be read with this correction therein that thesame may conform to. the record of-the case inthe Patent Oifice.

- Signed and sealed this 30th day of anuary, A. 1)., 1912 g [sEAL] 7 yC. C. BILLINGS,

Acting Oommzlsionr of Patents.

orrectlon in Letters Patent No. 1,005,140.

It, is hereby certified that in Letters Patent No. 1,005,140, grantedOctober 10,

. 1911, upon the application of Wilhelm Bauer, of Vohwinkel, and AlfredHome and Rudolf Mayer, of Elberfeld, Germany, for an improvement in VatDyes, an error appears in the printed specification requiring correctionas follows: Page 1, line 70, beginning with the word Its strike out allmatter to and including line 86; and that the said Letters Patent shouldbe read with this correction therein that the same may conform to therecord of the case in the Patent Otfice.

orrection in Letters Patent No. 1,005,140.

Signed and sealed this 30th day of January, A. D., 1912.

[SEAL] C. C. BILLIN GS,

Acting Gammissiomr ofPatents.

